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在UIScrollView中同时允许单击手势识别器和双击

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所以我在UIScrollView里面有一个UIImageView，我需要捕获它们： - 单击手势 - UIImageView的双击手势

双击手势应该作为缩放动作发送到UIScrollView . 单击手势由我自己创建的UITapGestureRecognizer捕获 . 双击手势具有比单击更高的优先级（当有双击时，放大滚动视图，否则执行单击）

到目前为止，如果我将单击手势识别器添加到滚动视图，则立即识别单击并且不能识别双击 .

如果我将单击手势识别器添加到imageview，它从不接收任何动作，但双击工作

任何建议表示赞赏，谢谢..

ios objective-c uiscrollview

3 回答

  • 0

    试试这段代码，

    Objective - C

    UITapGestureRecognizer *singletap = [[UITapGestureRecognizer alloc]
                                                     initWithTarget:self
                                                     action:@selector(singleTap:)];
    singletap.numberOfTapsRequired = 1;
    singletap.numberOfTouchesRequired = 1;

[scrollView addGestureRecognizer:singletap];


UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc]
                                                 initWithTarget:self
                                                 action:@selector(doubleTap:)];
doubleTap.numberOfTapsRequired =2 ;
doubleTap.numberOfTouchesRequired = 1;

[scrollView addGestureRecognizer:doubleTap];



[singleTap requireGestureRecognizerToFail:doubleTap];

    Swift 3.0

    var singletap = UITapGestureRecognizer(target: self, action: #selector(self.singleTap))
singletap.numberOfTapsRequired = 1
singletap.numberOfTouchesRequired = 1
scrollView.addGestureRecognizer(singletap)
var doubleTap = UITapGestureRecognizer(target: self, action: #selector(self.doubleTap))
doubleTap.numberOfTapsRequired = 2
doubleTap.numberOfTouchesRequired = 1
scrollView.addGestureRecognizer(doubleTap)
singleTap.require(toFail: doubleTap)
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  • 2

    最佳答案实际上是最后一行倒置 . 正确的代码应该是：

    [singleTap requireGestureRecognizerToFail:doubleTap];
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  • 6
    UITapGestureRecognizer *tapRecognizerForSingleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapAction:)];
[tapRecognizerForSingleTap setNumberOfTapsRequired:1];

UITapGestureRecognizer *tapRecognizerForDoubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTapAction:)];
[tapRecognizerForDoubleTap setNumberOfTapsRequired:2];

    两者都添加在同一图像视图中，并实现您想要的只需添加以下行 .

    [tapRecognizerForSingleTap requireGestureRecognizerToFail:tapRecognizerForDoubleTap];

    通过以上行，您要求单击才会识别它是否不是双击 .

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